JPH029183Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to the structure of a duct connection.

<Problems that this invention aims to solve> Conventionally, the connection part of a duct is made by first welding cut L-shaped angle pieces to form a rectangular frame-shaped flange.
The flange is fitted into the open end of the duct and attached to the duct with rivets, but the duct connection requires many skilled processes to form. However, there were still problems such as thermal distortion during welding and tensile deformation due to riveting. This invention was originally proposed by the applicant in 1983.
This is an attempt to solve this problem with a structure different from No.-100702.

<Structure of the invention> The present invention provides a narrow band-shaped stepped groove with a hooked stepped surface at the opening side end of each side plate constituting the duct, and a side plate flange with a bent edge is provided following the stepped groove. Each plate flange is formed by being folded, and each plate flange is provided with an end surface on the lower inner surface of the tip of the bent edge for hanging by folding the bent edge inward, and each plate flange has an L-shaped corner member that straddles between the plate flanges. The inner bent piece provided on one side of the L-shaped corner member is butt-fitted into the stepped groove with the hooked stepped surface, and the end of the outer inclined piece provided on the other side is inserted into the hooked corner member. A duct connection structure characterized by being clamped at the end face.

<Example> Examples will be described below based on the drawings.

Both sides of the two sets of side plates AB are passed through a roll forming machine to form female gobs 2, 2 on both sides of side plate A and male gobs 3, 3 on both sides of side plate B, and then the other side plates AB are formed in the other direction. Hooked step surfaces 4a (step surfaces bent at right angles) are provided on both sides to form a step, and then the end edges of the step are folded up to form a plate flange 6. In each case, the plate flange 6 has its tip bent at a right angle to form a bent edge 5.
Then, the tip of the bent edge 5 is further folded inward to form a hooking end surface 7a at the bent portion 7 and the inner end of the bent portion 7.

In addition, in FIG. 4A, the bent portion 7 is curved so that the end surface 7a for latching is directed diagonally upward toward the bent edge 5, and
In FIG. 4B, it is folded over and over so that the end faces are parallel to the plate flange 6.

The side plate AB processed as described above is attached to the female-shaped bevel part 2.
The square cylindrical duct shown in FIG. 1 is assembled and formed by inserting the male gob 3 into the duct. At the opening side end of the duct, a hooked stepped surface 4a, a narrow strip-shaped stepped groove 4, and a plate flange 6 are formed following the stepped surface 4a. Next, an L-shaped corner member 8 is fitted between the plate flanges 6 of each duct. The L-shaped corner member 8 is made by punching a metal plate into an L shape, and has plate surfaces 8a, 8a and both plate surfaces 8a, 8a on both sides of the hook folding direction.
An inner bent piece 8b is formed by folding one longitudinal side, and an outer inclined piece 8b is formed by folding the other side diagonally.
c, and an exposed plate portion 8d between both plate surfaces 8a, 8a.
It also has a hook-shaped corner cover 8e formed by folding up pieces that sandwich the middle inner corner of the L-shaped corner member.

Therefore, the L-shaped corner member 8 is attached to the plate flange 6.
When the member 8 is fitted across the space between the two, the plate surfaces 8a on both sides of the member 8 are in contact with the inner surface of the plate flange 6, and the inner bent piece 8b of the member 8 is tightly fitted into the step groove 4 and the end surface thereof is in contact with the inner surface of the plate flange 6. It abuts against the hooked stepped surface 4a, and the tip of the outer inclined piece 8c of the member 8 is clamped by the end surface 7a for hanging, and the exposed plate part 8d is exposed between the plate flanges 6. The corner cover 8e is fitted into the corner between the stepped grooves 4 of the duct, filling the gap between the plate flanges 6 as shown in FIG. 3, and forming a connection between the ducts.

Thus, the plate flange 6 and the L-shaped corner member 8 are in contact with each other between the two ducts, and a stud or bolt is passed through the stopper hole 9 between the two ducts, and the connection is made without a gap using a nut or screw.

<Effects of the invention> As described above, in the present invention, a stepped groove is sandwiched between the opening end of the duct and a plate flange is formed by the duct plate, so that welding that conventionally occurs when forming the flange is avoided. This eliminates all the thermal distortion caused by ducts and tensile deformation caused by rivets for attachment to ducts, resulting in the effect that ducts can be connected without distortion. In addition, the L-shaped corner member has an inner bent piece that is hooked and fitted into a stepped groove with a stepped surface, and the tip of the outer slanted piece is clamped by a hooking end surface, so that external pressure can be applied to the duct. This has the effect that there is no fear that the corner member will fall off unnecessarily even if the corner member is applied.

Furthermore, the stepped grooves provided on each side plate of the duct and the bent edges and folded portions provided on the end plate flanges impart a rib effect to the duct and end plate flanges, thereby producing the effect of reinforcing and strengthening the duct and end plate flanges.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the opening side end of the duct, Fig. 2 is a front view of the L-shaped corner member, Fig. 3 is a perspective view showing the L-shaped corner member in a straddling state, Fig. 4A
4B is the same, a longitudinal sectional view showing the second example, FIG. 5 is a developed view of the side plate A, 2 is a female goby, 3 is a male goby, 4 is a stepped groove, 4a is a hooked stepped surface, 5 is a bent edge, 6 is a plate flange, 7 is a bent portion, 7a is an end surface for hanging, 8 is an L-shaped corner member, and 9 is a stop hole.

Claims (1)

[Scope of utility model registration request] A narrow band-shaped step groove having a hooked stepped surface is provided at the opening side end of each side plate constituting the duct, and a side plate flange with a bent edge is formed by folding up following the step groove,
In each case, an end surface for hanging is provided on the inner surface under the tip of the bent edge of the plate flange by turning the bent edge inward, and in each case, an L-shaped corner member is fitted between the plate flanges, and the L-shaped corner member is fitted between the plate flanges in each case. The inner bent piece provided on one side of the shaped corner member is butt-fitted into the stepped groove with the hooked stepped surface, and the end of the outer inclined piece provided on the other side is clamped by the end surface for latching. A duct connection structure characterized by: